Horizontal screening machine



Jan. 12, 1960 Filed Sept. 21, 1954 K. MULLER ETAL 2,920,762

HORIZONTAL SCREENING MACHINE 3 Sheets-Sheet 1 KURT MULLER a CARL SCHMIDTATTORNEYS K. MULLER ET AL HORIZONTAL SCREENING MACHINE Jan. 12, 1960 3Sheets-Sheet 2 Film! Sept. 21. 1954 Inventors KURT MULLER a CARL SCHMIDTBY 7 a? ATTO NEYS Jan. 12, 1960 K. MULLER ETAL 7 2,920,762

HORIZONTAL SCREENING MACHINE Filed Sept. 21, 1954 5 Sheets-Sheet'b'Inventors KURT MULLER a CARL SCHMIDT BY j 5" ATT NEYS United StatesPatent 2,920,762 HORIZONTAL SCREENING MACHINE Kurt Miiller,Recklinghausen, and Carl Schmidt, Mulheim (Ruhr), Germany ApplicationSeptember 21, 1954, SerialNo. 457,398 Claims priority,.applicationGermany September 22, 1 953 11 Claims. (Cl. 209-4965) This invention,relating as indicated to a' horizontal screening machine, isparticularly directed to a; novel type of screening machine foraggregate, including coal and the like, in which the screen supportingstructure is resiliently mounted on elastic means in order to produceboth ahorizontal and vertical component of movement, to sift theaggregate on the screen and incidental This invention incorporates meansfor varyingthe re I sultant direction of movement of the screen, whichis periodically" vibrated by" vibrating means comprising an electricmotor, an eccentric, and a coupling means to the vibrating screen bodywhich is resilient. Other types of driving means ofequivalentconstruction could also be used.

This invention is particularly directed to a novel type of horizontal:screening machine which incorporates means for"adjusting directionof themovement'or stroke of the vibrating screen body with the means forconserving the energyof the vibration by a bounce-back or rebound devicecomprising one or more resilient members on oppositely disposedsides ofa plate secured to the vibrating body. Said rebound meansand theresilient arms, which are secured to the base 'frame, are incorporatedin anintegral structure on a circular plate, so that said plate may beadjusted to the correctangle to produce the desired direction ofthrow ofthe vibrating screen body; In this case'th'e vibrating screen body andits end mounting means, comprising tubes, are mounted within the sideplates and side frame structures in a manner so that the mass of thevibrating screen body is reduced; The incorporation of the bounce-backdevice and the resilient means for mounting the screen body in asingle'structure permits a multiplicity of units to be attached to oneanother to increase the length of the unit. Inherently this produces aunit which can be combined inmultipleunits and shipped to the point ofinstallation as individual pieces, each. of said subassembly being.- acomplete unitin and of itself and are actuated by the vibrating. meansat the endof the screen body.

This structure would be muchlighter in weight than known horizontalscreens of the Schieferstein type, in addition to having. thepossibility of changing: the angle of throw to the vibrating-screenbody;

An object of this invention is tov produce an improved horizontalscreening machine, incorporating features'of adjustability of thedirection or the throw of the vibrating screening body along with animproved resilient mounting meansfor thescreen body intermediate thesaid frame elements; incorporating said resilient mounting means,together 'Withabounce-back devic'ek resultingin adjustabilit'y, greaterlength, and considerably reduced mass to the machine; i I

A further object of this invention is to improve the Schiefersteinsystem of horizontal screening to produce quick adj ustability in avibrating screening device, to both the resilient springs and therebound devices simultaneously.

A further object of this invention is to produce" a vibrating' screeningdevice that can be made of individual components and added to as desiredto produce a screening' table of desired length for any screeningvoperation, said intermediate sections or sub-assemblies being completely balanced in and of themselves and incorporating identical unitsfor positioning the resilient means and the bounce-back devices for thevibrating screen body to the side framing members.

A further object of this invention is to produce an improved mountingmeans for a horizontal screening machine incorporating features ofadjustability, reduced weight, in which the resilient means comprisingsteel springs are mounted intermediate the bounce back device, resultingin lowered stresses in the vibrating screen body and reducing the weightof said screen body.

To the accomplishment of the foregoing and related ends, said invention,then, consistsof the vibrating screening bo'dy hereinafter fullydescribed and particularly pointed" out inthe claims, the followingdescription setting forthin detail one approved methodof carrying outthe invention, such disclosed method, however, constituting but one ofthe various ways in which the principles ofthej invention may be'used.

In the' draw'ing's i Fig-5 l-(i'sa sideview of the improved vibratingstructure of this irivention, v I

-Fig'f 2 is a cross-sectional view along" the lines B-B of Fig-l 1, A

Fig-1-3 isan enlarged side vie'w'of theend mounting means for thevibrating screening apparatus,

Fig; 4 is" a cross-sectional view along the lines C-C of Fig. 3 showingthe supporting elements thereof, and

Fig;' 5' is a fragmentary side elev'ation view of a multiplicity ofunits as combined in thi s invention.

For a better understanding of the Schieferstein system, a briefexplanation of the relative size and weights of the components as wellas a brief mathematical presentation may be necessary. In" one examplethe amplitude of the vibration-in the base frame may be designated as111'. The weight of-the base frame may be expressed as M and theamplitude of the screen body as a and the weight ofthe screen M Itwillthen be seen that the following formula will be true.

Fromexperience it is understood that the best'resultsare obtained whenthe weight of the vibrating screen body to the base frame, i.e., M to Mis in the relationship of 1 to 4. It will further be appreciated thatsome spacing is required between the vibrating screen body and the baseframe.

Figs. 1- and'2 show particularly the details of the invert tion,hereinafter to be more fully described. In this construction inthevibrating screen body we have framing e1ements 12 and crosssupportsll, which are vibrated by means of-a'drive mechanism. Thisdrivemechanism con sists of an electric motor 2, connected by means ofdriving belts 3, to an eccentric driving mechanism 4, having a resilientcoupling 5, said coupling being'conneoted to the screen body. Theeccentric drive operates the'screenbody andcausesit to vibrate as soonas the motor isstarted. In thisapparatu's frames 12 are made from angleirons on the top, to which-woven wire or screen plate section 13 are--attached= A channel or bar element 16 of light c011 struction bordersthe longitudinal screen framing elements 12 and these are connectedtogether by means of U bolts and clamps 14. The spacing between thescreen members 13 are covered by plates 15. By this combination of partsthe screen framing elements 12, the screen cloth 13, and the channel orbar elements 16 comprise the vibrating parts of the apparatus. Thematerial or aggregate being screened will pass through screen 13 and gointo the hopper 40 as shown by the arrows, but the coarser materialswill travel along and go off the end of the screen as shown at 41. Thevibrating parts of the apparatus are carried by base frame 7, which ispositioned upon other supporting means, such as the ground shown at 10,and this is resiliently mounted by means of rubber buffers or cushionsshown at 9.

This combination of units has some considerable advantages, as will bemore fully considered, because the vibrating screen parts are soarranged with the supporting springs centrally located with respect tothe rebound devices, that a long screen can be formed of a series ofsimilar units, which are secured together. The arrangement of theindividual components, screen body and supporting means, is such thatthere the stresses in the vibrating parts will be greatly reduced fromthose in the Schieferstein system, wherein the resilient spring meanswere physically spaced from the rebound elements and the latter was inthe center of the large screen body. This- .4 screw fastening means 24and the entire assembly can be turned and adjusted by the slot 25.

On the disk is securely mounted a U-shaped support member 26, whichholds the flat springs 6. Said springs are connected at their ends,shown at 28, to the transverse support means 11 of the vibrating screenbody. These are welded onto flanges 29, and fastened by means of bolts30. Said flanges carry on their oppositely disposed faces 31 a platesurface adapted to co-operate with the rebound mechanism and the rubberbuffers or bumpers 32. By altering the position of the disks 23 in theslot 25, the angle can be changed, as may be seen by the indicator 34,and the dial 33, and any specific angle can be read on said dial. Bythis mechanism the throw angle is changed as desired to produce thenecessary action for the aggregate being screened. The entire assemblyand spring elements, as well as the rebound mechanism, are in a singleunit, and they do not produce-undesirable moments in the vibratingscreen body or in the base frame elements. This permits each assembly,or sub-unit of the combination, to be separately supported so thatmultiple units can be assembled to form a single horizontal screeningmachine. Each uni-t may be fixed at a set angle as desired for thematerial being screened, and the assembly will operate in new system nowcauses the rebound means to be on opposite sides of the resilientsprings and the weight and size of the vibrating screen parts can besonsiderably reduced according to the formula, explained earlier. Inorderto give a specific example of the system and compare it with theoldsystem, the following figures will be helpful.

The old Schiefersteinsystem might in a particular example have a widthof 4 ft. and a length of 13 ft. with a weight of one ton for thevibrating screen body, so the whole machine weighed five tons, i.e., thebase frame weighed approximately four tons according to the formulaearlier described. With the new and improved system ofthis invention thesame size machine would have the vibrating frames 11, 12 and 16 andwould weigh only 800 lbs., approximately 40% of the earlier weight, andthe over-all machine weight would be two tons. This is a considerableadvantage inasmuch as the lightness of construction in process equipmentis of importance, since these machines are frequently assembled instructures one above the other, and a tremendous weight of equipment isundesirable from a structural standpoint, and is also very difficult tohandle and assemble. Consequently this new unit, weighing as little asit does, can be made up of components and fabricated in very largescreens. Needless to say, the power is in proportion to the weight beingmoved, and isconsiderably reduced in this construction.

In the drawings, Figs. 1 and 2 also show curved side plates 17, whichare attached to the base frame element 7. These end above the wire meshand will not be vibrated with the vibrating screen body. Thisconstruction is different and reduces the weight of the side plates inthe vibrating screen body. 'These plates may be moved with screwfastening means 19 and adjusted in slots 18 as required.

A further advantage in this construction is that the vibrating screenbody is fastened intermediate the ends, top and bottom of the base sideframe elements and not above, as in the earlier Schiefersteinconstruction, making the over-all assembly of considerably reducedheight. By this construction the transverse support members of thevibrating screen body pass through the base frame element 7 at holes 22in the base side framing members 21 and these members are connectedtogether by means of the flat springs 6. i

, Figs. 3 and 4 show the attachment of these springs 6 to the frame 7 bymeans of steel disks 23. These are mounted on top of cylindricalopenings 22 of the frame 7. The disks 23 will be pressed against theframe by means of unison.

As an illustration of a unit comprising a number of segments, Fig. 5 isthe side elevation view of an assembly comprising multiple units. Saidassembly is comprised of similar parts, 7abc and d, and these areconnected by means of screws, or with other type, such as elastic. Inthe latter case rubber parts 35 would be put between the framingelements, 7abc and d. Each segment of the-side frame 7 would have a disk23, with all of the other parts, including spring elements 6 and therebound mechanism as shown in the previous views. It is possible to havemore than one disk in an element, and two disks 23 may be assembled inone section, such as 7a, and these then could be connected in-multipleunits by the means previously described.

Having thus described our invention in its simplest form, variations andmodifications may be resorted to by those skilled in the art withoutdeparting from the principles of the invention. All of these variationsand modifications are considered to be within the true spirit and scopeof the present invention, as disclosed in the fore going description anddefined by the appended claims.

We claim:

1. In a vibrating screening apparatus, a pair of longitudinal base sideframing members, a vibrating screen body intermediate thereof havingsupport members extending into the sides of said longitudinal base sideframing members, each support member adjacent its end portions extendingin structures carrying resilient spring elements and rebound. plates andbeing supported by said spring elements, said structures being mountedto said base side framing elements and being capable of angularadjustments with respect thereto to thereby provide a varying directionof throw for the vibrating screen apparatus, and actuating means for thevibrating screen body.

2. The vibrating screening apparatus of claim 1 in which the apparatusis formed of a plurality of units, the vibrating screen bodies beingcoupled together and the longitudinal base side framing elements beingcoupled together to increase the overall length thereof, whereby thescreening apparatus may be of indefinite extent with actuation from acommon source because of the balanced action between the screen bodyunits and the framing elements in each of the separate units.

3. In a vibrating screening apparatus, a pair of longitudinal supportmembers, a vibrating screen body comprising an open screen surface andrigid support members therefor, means interconnecting the vibratingscreen body and the pair of longitudinal support members, said meanscomprising a circular plate secured to said longitudinal supportmembers, a pair of rebound plates on opposite sides thereof having aresilient cushioning means on the sides facing each other, a resilientspring mounting means connected to an extension of the vibrating screenbody positioned intermediate said rebound plates, said springs beingconnected to the circular plate, adjustment means for said circularplate relative to the longitudinal support member, and means connectedto the vibrating screen body for vibrating the screen with a horizontaland vertical component, the line of action of said actuating means forthe vibrating screen body and the resilient spring means being at anangle relative to one another.

4. In a vibrating screen apparatus of the counter oscillating mass typecomprising elastically supported base members and a screening surfaceconnected thereto by means of resilient guide springs, the novelcombination of a plurality of screening surfaces, a plurality ofsupporting frames therefor and resilient interconnection means betweenthe contacting portion of the screen frame and of the base frame, andcross beams between each screening surface and its supporting frames,and guide springs connected to the ends of said cross beams andconnected to the base frames, and resilient cushioning means and reboundplates engaged by the ends of the cross beams and resilient springs, andmeans connected to the vibrating screen body for vibrating the screenwith a horizontal and vertical component.

5. In a horizontal screening apparatus of the counter oscillating masstype, a resiliently supported base frame, a plurality of vibratingscreening surfaces connected thereto by means of rebound plates andresilient guide springs, cross beams on the end of said guide springbetween the base frame supporting said vibrating screening surfaces,resilient springs between the base frame supporting the ends of saidcross beams, and rebound plates and springs on said base frame adaptedto engage the cross beam and resilient guide spring.

6. In a horizontal screening apparatus of the counter oscillating masstype, a base frame having a pair of longitudinal support members, avibrating screen body, means interconnecting the vibrating screen bodyand the pair of longitudinal support members, said means comprising apair of rebound plates on opposite sides thereof having a resilientcushioning means on the sides facing each other and a resilient springto the longitudinal support members, said interconnecting means beingpositioned between intermediate rebound plates, and means connected tothe vibrating screen body for vibrating the screen with a hori zontaland vertical component.

7. The horizontal screening apparatus of claim 5, in which each of thevibrating screening surfaces is connected to a separate base frame andall of the components are interconnected.

8. In a horizontal screening apparatus of the counter oscillating masstype, a resiliently mounted base frame having parallel sides, a screenframe therebetween and means interconnecting said screening frame andbase frame and the parallel sides of said base frame centrally locatedin the sides thereof comprising resilient springs connected to the baseframe and the sides thereof and to the screen frame, and rebound plateson said base frame adapted to be engaged by the resilient springs.

9. In a horizontal screening apparatus of the counter oscillating masstype, a base frame, a vibrating screening frame, and meansinterconnecting the screen frame and base frame centrally located on thesides thereof comprising a common support point for the screening frame,said interconnection combining a resilient spring on said base frameconnected to the screen frame and rebound plates on the base frame onopposite sides of the end of the resilient spring and the support forthe vibrating screen frame.

10. In a horizontal vibrating screening apparatus of the counteroscillating mass type, a base frame, a screen frame and meansinterconnecting the base frame and screen frame on the sides thereof ona transverse axis centrally located with respect to the center of thesides of the base and screen frame at the approximate transverse centerof gravity thereof, said interconnecting means comprising a resilientspring connected to the base frame and to the screen frame and reboundplates on the base frame on opposite sides of the ends of said resilientspring whereby a single unit can have one point of connection between ascreen frame and be vibrated with a horizontal and vertical componentwith respect thereto.

11. The horizontal screening apparatus of claim 10, in which a pluralityof screen apparatus are interconnected having resilient means betweenthe contacting portions of the screen frame and of the base frame,wherein an operating horizontal screening machine will be balanced withrespect to each section with only a minimum amount of transverse loadingthrough the resilient means.

References Cited in the file of this patent UNITED STATES PATENTS2,020,013 Bailey Nov. 5, 1935 2,168,838 Church Aug. 8, 1939 2,701,061Kluge Feb. 1, 1955 FOREIGN PATENTS 668,069 Germany Nov. 25, 1938 677,571Germany June 28, 1939

